Improvement in hot-air furnaces



s. J. roLnl Hut Air Furnace.

" Pazelmd MaJ/11,1875.

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OOOGOOOGO THE GRAPHIC C0.PHOT0.LITH.39&4Y PARK PLAGE,N.Y.

STEPHEN J. GOLD, OF CORNVVALL, CONNECTICUT.

IMPROVEMENT IN HOT-AIR FURNACES.

Specfcation forming part of Letters Patent No. 63,009, dated May 11,1875; application filed September 10, 1874.

To all whom it may concern:

Beit known that I, STEPHEN J. GOLD, of Cornwall, in the county ofLitchfield and State of Connecticut, have invented certain Improvementsin- Hot-Air Furnaces, of which the following is a specification:

The principal objects of this invention are, first, cheapness ofconstruction combined with efficient radiationV of the heat, second,increased efficiency of the grate and facility in clearing it from ashesand clinkers; third, facility in cleaning the smoke-chambers and `iluesfrom ashes, dust, and soot.

For the accomplishment of these purposes one part of the said inventionconsists in the combination, with the shell of a furnace, of a coveringparallel therewith, and composed of a series of radiating platesseparable therefrom and studded with projections, as hereinafterdescribed.

Another part of Athe said invention consists in the combination, withthe ash-pit and with a stationary perforated bottom to the smoke-kchamber or smoke-flues, of a movable and correspondingly-perforatedplate placed upon or in close proximity to the said bottom, whereby theashes, 85e., in the smoke-chamber or smoke-fines may be vdischargedtherefrom through the said corresponding openings into the ash-pit by asliding or vibratory movement of the said movable plate, as hereinaftermore fully set forth.

Another part of the said invention consists in the combination of thesaid movable plate and the shaking apparatus of the grate, whereby thedischarge of the ashes, Ste., in the smoke-chamber or smoke-iiuesisinsured by the shaking ofthe grate.

Figure lis a vertical central section from front to back of my improvedhot-air furnace. Fig. 2 is a vertical central section of the ashpit onthe same plane. Fig. 3 is an outside elevation of one of theradiating-plates to be attached to the outside of the upper portion ofthe furnace. Fig. 4 is a plan of the perforated plate, which forms thebottom of the smoke-chamber or smoke-lines. Fig. 5 is a plan of thecorrespondingly-perforated plate placed upon the plate shown in Fig. 4.Fig. 6 is a top view of my improved furnace.

A represents the outer shell of the furnace,

which may be made of sheet-iron and of any proper thickness. B is aninner cylinder, which rests on the top of "the ash-pit, and is designedto form, with the shell A, a smokechamber or smoke-due or iiues betweenthe two, and, in conjunction with the said shell, to cause a descendingdraft to the exit flue or pipe ct. The cylinder B may be made ofcastiron and lined with lire-brick b. The fire-door and coal-chute forsupplying fuel are indicated by the dotted lines just above thefire-brick, and should extend into or through the wall surrounding thefurnace. C is the ash-pit. It is so constructed that the lower portionof it underlies the smoke chamber or ue to receive the ashes, soot,Ste., which may collect in said chamber or flue, and the upper part ofsaid ash-pit is made smaller, as shown at c, to receive and support thecross-bar D, which supports the inner grate E, and on which cross-barsaid inner grate may be tilted to dump it and discharge the contents ofthe lire-box. This grate is made conical in form, descending from thecenter to the outside, as shown in Fig. l, and a small space is leftbetween it and the outer grate F, which latter is inclined inwardlydownward, as shown in the same iigure, which construction very muchfacilitates the discharge of the ashes and elinkers from the lire bygiving them a tendency to slide downward to the space between the in-,ner and outer grates, and there be discharged when the inner grate isagitated. The form of the inner grate also has a tendency to give apartially-outward direction to the air entering the fire, therebypromoting combustion in the outer portions near the fire-brick. e is astem or shaft, cast with the inner grate E, and extending downwardthrough the crossbar D to a convenient position for the attachment ofthe rod or lever f, which is used for shaking the grate, anextension-piece, g, removable at will being attached, if necessary, tofacilitate its operation. Gis the plate, be-

fore alluded to, which forms the permanent bottom of the smoke-chamber,and also forms a part of the 'ash-pit. An inspection of Fig. ,4 shows aseries of holes, h It, through this plate, to allow the soot and ashesfrom the smoke chamber or flues to fall into the lower part of theash-pit. This plate G is covered by another annular plate, H, which alsohas holes z' t' through it to coincide, when necessary, with the holes7L h. This plate H is made in halves, as shown, to allow it to be placedin position. This plate H has a fork or 1ip,j, (shown in dotted lines inFig. 5,) attached to or cast with it, which fork or loop extends downthrough the hole k in the plate Gr, and astride the lever f or itsextension g, so that when theleverf is vibrated to shake the grate, theplate H will be turned so as to bring its holes i into and out ofcoincidence with the holes h h in the plate G, by which the ashes andsoot in thesmoke-chanuber will necessarily be efficiently dischargedtherefrom. After the shaking of the grate has been accomplished, thelever should be left turned into such a position as to close theopenings through these plates G and H from the smoke-chamber to theash-pit by leaving the holes h hand Itout of coincidence with eachother. top I of the furnace may also, as well as the shell A, be made ofsheet-iron of proper thickness. This top I is covered with a removableplate, J, of the same form and iittin g closely' to it, which plate J isprovided with projections Z l for radiating the heat into thesurrounding atmosphere. The sides of the furnace down to a little belowthe top of the cylinder B are also covered with removable plates K, madeconcave-con vex to it the sides of the shell A, and having projections Zl to radiate the heat into the surrounding atmosphere. These plates Kare shown in the drawings as being hung upon projections m m at the topof the furnace.

The brick-work in which the furnace is designed to be inclosed, whenused for warming rooms through pipes and registers, is indicated bydotted lines in Fig. 1.

The operation and most of the advantages TheA resulting from theconstruction herein described and shown have already been sufticientlyset forth; but it will be observed that in the construction hereindescribed and shown, the outside case may be cheaply made of sheet-iron,and yet will be sufficiently protected from-the destructive effects ofthe heat, partly by the inner cylinder B and partly by the radiatingplates J and K K, provided with their projections for the rapidradiation of heat into the surrounding atmosphere, by which the heat isso rapidly taken from the sheet-iron casing as to prevent its beingreadily injured by overheating.

I am aware that removable flanges placed with their edges upon thecasing of a furnace are not new, and these I do not cla-im nor do Iclaim projections from the sides of a furnace for radiating heat, asthese are old and well known.

I claim as my invention- 1. The combination, with the shell of thefurnace, of radiating plates, the hat surfaces of which are parallel toand in contact therewith, and studded with projections, substantially ashereinbefore set forth.

2. The combination, with the ash-pit and with a perforated bottom to thesmoke-chamber or smoke-lines, of the plate H, whereby the ashes in saidsmoke-chamber or smokeiiues are dumped directly into the ash-pit,substantially as hereinbefore set forth.

3. The combination, with the plate H, of the grate E, projection j, andlever f g, or its equivalent, substantially as hereinbefore set forth.

STEPHEN J. GOLD.

Witnesses:

J oHN DAVIS HATCH, Trios. P. How.

